PNC warned of cyberattack

Some PNC Bank customers may experience difficulty logging onto the bank's website, following a warning from a computer hacking group that it planned cyberattacks on PNC and other large banks.

PNC spokeswoman Amy Vargo said on Tuesday that the bank was aware of some intermittent problems, but she encouraged customers to try logging again if they have trouble the first time.

The al Qassam Cyber Fighters Group posted to an Internet message board that it would again target PNC, along with JPMorgan Chase, Bank of America, U.S. Bank and SunTrust in a second phase of attacks that previously cut access to bank websites.

China files for most patents

The U.N. says the Chinese filed the most patent applications in the world last year, overtaking the U.S. for the first time.

The U.N.'s World Intellectual Property Organization says China's patent office received 526,412 applications in 2011, ahead of the United States with 503,582 filings.